(19)

(11)

EP 3 840 868 A2

(12)

(88) Date of publication A3: 14.05.2020 (43) Date of publication: 30.06.2021 Bulletin 2021/26 (21) Application number: 19859907.8 (22) Date of filing: 23.08.2019

(51) International Patent Classification (IPC):  B01F 3/08(2006.01) B67D 1/12(2006.01) F16K 1/52(2006.01) G05D 11/02(2006.01) B01F 15/04(2006.01) B67D 7/74(2010.01) G01F 1/05(2006.01) (86) International application number: PCT/US2019/047907 (87) International publication number: WO 2020/055573 (19.03.2020 Gazette 2020/12)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 26.08.2018 US 201862722916 P (71) Applicant: Dur-A-Flex, Inc. East Hartford, CT 06108 (US)

(72) Inventors: SMITH, Kyle, Sanford Windsor, CT 06074 (US) BHAMIDIPATI, Murty, Venkata Simsbury, CT 06070 (US) HUGHES, David, Royston Fairfield, CT 06824 (US) SMITH, Robert, S. Windsor, CT 06074 (US) FERRIS, Peter, V. Hartford, CT 06106 (US) ALLEN, Daniel, R. Glastonbury, CT 06033 (US) SPERRY, Charles, R. Chester, CT 06212 (US) KROLL, David, M. Westfield, MA 01085 (US) (74) Representative: Sanger, Phillip Simon  GWIP Ltd Highdown House 11 Highdown Road Leamington Spa Leamington Spa CV31 1XT Leamington Spa CV31 1XT (GB)